Mouse Rosette Positive B Cells Fail to Synthesize Immunoglobulin Following Incubation with Pokeweed Mitogen
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Mouse erythrocytes form spontaneous rosettes with a population of B lymphocytes from normal individuals and from patients with B cell chronic lymphocytic leukaemia (CLL). Since lymphocytes from patients with CLL respond poorly to pokeweed mitogen (PWM), we have compared mouse rosette positive (MR+), mouse rosette negative (MR-), and unfractionated B lymphocytes from normal individuals in their response to PWM. Mononuclear cells were fractionated into B, MR+ and MR- cell populations and then combined in 1:1 proportions with mitomycin-C treated T cells in culture media. Lymphocyte co-cultures were incubated for up to 10 days in the presence of PWM. Supernatant immunoglobulin (SIg) levels, percentage intracytoplasmic immunoglobulin (ICIg), and proliferative responses were determined. MR+ cells alone failed to produce significant levels of SIg (P less than 0.025) or percentages of ICIg positive cells This decreased synthesis of immunoglobulin by MR+ cells occurred in the presence of adequate T cells, macrophages and a satisfactory proliferative response.
Phenotype of chronic lymphocytic leukemia (CLL) B-cells. B-CLL cells express the Leu-8 antigen.
Cafaro A, Napolitano M, Zoli V, Pacilli L, Mezzaroma I, DE LAURENZI A Blut. 1987; 54(1):43-9.
PMID: 3099866 DOI: 10.1007/BF00326026.